Plow mold-board



(ModeL) J. QUIN. PLOW MOLD BOARD.

No. 258.806. Patented May 30, 1882.

INVENTOR WITNESSES zam% fi ATTORNEYS.

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- TIM TED STATES ATENT Fries.

JOHN QUIN, OF WAKEMAN, OHIO.

PLOW MOLD-BOARD.

SPECIFICATION forming part of Letters Patent No. 258,836, dated May 30, 1882.

Application filed December 12, 1881. (ModeL) To all whom it may concern:

Be it known that I, JOHN QUIN, of VVakeman,in the county of Huron and State of Ohio, have invented a new and useful Improvement in Plow Mold-Boards; and I do hereby declare that the following is a full, clear, and exact description of the same, reference being had to the accompanying drawings, forming part of this specification, in which Figure 1 represents the several dimensions of the plow to be constructed and the width of the furrow-slice. Figs. 2, 3, 4, 5, 6, and 7 represent blocks by means of which the upper and lower construction-lines ofthe mold-board are formed, and Fig. 8 the mold-board completed with the straight-edge applied thereto.

M y invention relates to improvements in plow mold-boards; and it consists, first, in the peculiar conformation of the exterior concave surface of the mold-board and, secondly, in the method of constructing the mold-board, as hereinafter more fully described.

In the accompanying drawings, let A B, Fig. 1, be the perpendicular length of mold-board from B, the front point on land side, to A, on landside, from which point A a line drawn at right angles to A B will pass through the rear point of mold-board at its greatest width or overlap from A B; O D, the greatest overlap of mold-board at rear from landside; E F, the width of sod or slice to be turned over; G H, the width of the mold-board in front; I K, the height of mold-board from the ground at the share-point B, (lettered D N in Fig. 4.) A land-side view is shown at D N, Fig. 5, where the dotted line shows that it conforms to the front curve of the plow.

On suitable material draw the land-line A B (see Fig. 2) from B, the front land-corner of board. Make A B equal A B in Fig. 1-length ofmold-board. DrawAOatright angles toAB from the point A. Make it equal to O D in Fig. 1,which is the greatest overlap from land-line. From B, at right angles to B A, draw B D, and extend it indefinitely. Make B E equal to E F, Fig. 1the width of the sod to be turned over. From E draw E F parallel to A B. On the line'B D, extended, find the point from which, as a center, a circle will be described which will pass through the points B and (I. Mark the point P where the circle cuts F E. Draw P H at right angles to F E. The eircularline O P B will be the upper construction-line of the board. B is the frontcorncr at land-line; A B, length of board on landline; A 0, its greatest overlap at rear; 0 B, the diagonal length of board. Out the figure 2 on the line 0 P B. It will he represented by Fig. 3.

Take a squared smooth block of wood of the length A B and width ofA C, Fig. 2, and a few inches more than thickness E F, Fig. 1. A B O D, Fig. 4, represents a side view of it from furrow side. 0 D is the base or ground line; D, the frontpoint on the ground. Make D N equal to the thickness of the point; D F equal to E F, Fig. 1, the width of sod. From F draw F E parallel to O D, and from the point N, with radius B Gr, Fig. 2, describe a circle cutting F E at H. Join H Nand extend to G. Make H L equal to G A, Fig. 2. The line N L will be equal to A B, Fig. 2. From the points H and L draw H K and L I at right angles to O D. lut the blockat right angles to its face on the lines NL L I. The block N L L I I D will be a view of the block from board side, into which the shape of the board will be out; A landside view is given in Fig. 5, in which D N is the height of the point at its rear. The upper dotted line shows the front curve of the landside of the plow, where the line which gives the curve of the board crosses itthatis,theline given by the straightedge, hereinafter described. On suitable material draw the base-line on landside B A (see Fig. 6) from the frontpoiut, B, to A equal to D J, Figs. 4or 5. MakeB Gequal to D K, Figs. 4 or 5. MakeB E equal to G H, Fig. 1, (width of point.) Draw G O perpendicular to A B and equal to E F, Fig. 1, (width of sod,) and draw 0 K parallel to A B. B A will be the base-line on landside. It is the line D J, Fig. 5. The lines E O O K are the lower construction-lines of board. Fig.6 shows thelines on the ground when the plow is in position to work. Fig. 7 shows the position of the lines when the ground side of the plow is turned up. Cut out the figure B A A K K O O E. Take the pattern, Fig. 3, and place the front sharp point, B, on the front landside-corner of the diagonal or upper side, N L, of the block-that is, on N, Fig. 5, placeA on L, Fig. 5, and, as A C equals the width of the block, 0 will be on the rear corner of furrow side of block. Mark this circular line C P B and the point P. The circular line is the upper construction-line; P, the point at which the board is perpendicular. Then take the block, Fig. 5, and place its front base corner, D, on B, Fig. 6; its side D J on B A. Its rear end line will be perpendicular and over A K, Fig. 6. Turn up the ground side of block, and mark on it thelinesEOOK. Thesearethebaseorground construction-lines. Place the block on its base again, and cut into it from the furrow side to the points 0 below and P above. The line 0 P is one line of the shape of the board. It is the outside surface of the board. Cut away the block, so that when a straight-edge (one end of which is held at the point 0 of the line P 0, while its surface touches the upper curved line, as it revolves from the point P forward to B) will touch the face of the block the line of the straight-edge gives the shape of the board to the block from O on base side to P on upper side, forward to the point N on the upper or diagonal side of the block. The straightedge where it crosses the side plate or landside gives the front curve of the board also, (see dotted line, Fig. 5.) By continuing this front curve to the point at which the upper and lower lines of the point meet the straightedge will give the curvature of the board from the line 0 P forward.

To the rear of the line 0 P the curvature is found as follows: Divide the curved line C P above into any number of parts, and the straight line 0 K on base into a similar number of parts, and join by cutting from the board side into the block the next point above and the next below to the line 0 P; then the next points above and below to this line, and so to the end. Then smooth to auniform surface, and this surface will be the shape of the board to the rear of O P. As this gives the outside of the board, to get the inside mark the thickness of the board or the block along the upper curved lines and its thickness on ground-lines, and cut out, as before, to a smooth surface, will give the block the shape and curve of the inside of the board.

As the form of the mold-board given by the above description is what is sought, any method of construction by which the shape of the block is given to the board will answer. A sheet or plate of the proper thickness of. any' pliable material, or a board steamed, or strips of wood, can be made to conformlto the shape of the block. As the part of the board to the rear of the point 0 on ground is not necessary for use, all to the rear of a line run from the point 0 on ground to the extreme rear point above may be cut off.

As the above construction includes the plowshare to its narrow part, the size and shape of any point which maybe preferred can be cut off.

What I claim as my invention is- 1. A mold-board having the exterior curvature set forth, in which all the lines ofits coucave surface radiating from the point 0 upward, and also forward to the point B, lie in contact with astraight-edge revolved upon the mold-board with the point 0 as a center, substantially as described, and for the purpose set forth.

2. A mold-board having the exterior curvature set forth, in which all the lines of its concave surfac radiating from the point 0 upward, and a 0 forward to the point B, lie in contact with a straight-edge revolved upon the mold'board with the point 0 as a center, and the end of the mold-board in rear of the line 0 P, constructed as specified, substantially as described, and for the purpose set forth.

3. The method of constructing a plow moldboard as herein described, consisting in first forming on a block, in the manner set forth, the upper and lower construction-lines,C P B and E 0 K, and the points 0 and P, connected by the straight line 0 P, forming one line of the mold-board, then cutting away said block so that a straight -edge centered at 0 and revolved from the point P forward to the point B will always be in contact with the face of the block, and finally in constructing the end of the mold-board in rear of the line 0 P, as specified, substantially as described.

JOHN QUIN.

Witnesses:

M. 0. VANFLEET, Geo. B. VANFLEET. 

